public class Example4_10 {
	public static void main(String args[]) {
		Lader.下底=100;
		Lader laderOne = new Lader();
		Lader laderTwo = new Lader();
		laderOne.设置上底(28);
		laderTwo.设置上底(66);
		System.out.println("laderOne的上底:"+laderOne.获取上底());
		System.out.println("laderOne的下底:"+laderOne.获取下底());
       System.out.println("laderTwo的上底:"+laderTwo.获取上底());
       System.out.println("laderTwo的下底:"+laderTwo.获取下底());
    }
}
